C8 MediSensors, a company that aims to challenge the world’s largest medical-device companies in the contested glucose-monitoring space, has raised a $19 million add-on to a recently closed Series C round as it prepares for a European launch. The company’s noninvasive device, for people with severe diabetes who need constant monitoring, reads glucose information from the wearer’s skin and beams the information to a smartphone.

Also in today’s VentureWire…Kaminario has raised $25 million in new funding as venture investors rush to back new storage companies to capitalize on the migration to solid-state storage. Fresh venture capital has poured into flash storage start-ups on the heels of several acquisitions in that sector…Seed fund Tandem Entrepreneurs Management Services has closed its second fund, Tandem Fund II LP, at $32 million, according to co-founder Doug Renert. Tandem II is more than twice the size of its $15 million predecessor fund but less than the $40 million the firm had indicated it would raise…and Third Rock Ventures has launched and committed $40.7 million to Global Blood Therapeutics, a company that will develop oral drugs designed to treat an underlying cause of sickle cell disease.

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Elsewhere around the Web:

Microsoft is in talks to buy Yammer, a venture backed company that sells social-networking tools to businesses, for more than $1 billion, according to news reports. A leading provider of Web-based collaboration services, Yammer has raised $142 million, including an $85 million round earlier this year. Venture backers include Charles River Ventures, Draper Fisher Jurvetson, Emergence Capital Partners, Founders Fund, Khosla Ventures, Meritech Capital Partners and U.S. Venture Partners.

Speaking of acquisitions, the advertising-technology sector is seeing a shakeout in what one investment banker calls “the year of capitulation,” The Wall Street Journal reports.

A venture-capital dynasty, the Draper family, is the subject of a FastCompany profile. Check out the opening picture of the clan.

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Produced by the editors of Dow Jones VentureWire, Venture Capital Dispatch tracks the fast-moving developments at the intersection of high-tech innovation and venture capital finance. Featuring the VentureWire reporting team in the Silicon Valley, New York, Boston and Shanghai tech centers, Venture Capital Dispatch provides insight into the newest start-ups and latest trends in venture capital investing. Write us at VCdispatch@dowjones.com. For more information on Dow Jones products covering venture capital and other financial markets, go to http://pevc.dowjones.com.